CN114874527A - Bio-based controllable degradable mulching film and production method thereof - Google Patents
Bio-based controllable degradable mulching film and production method thereof Download PDFInfo
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- CN114874527A CN114874527A CN202210543600.7A CN202210543600A CN114874527A CN 114874527 A CN114874527 A CN 114874527A CN 202210543600 A CN202210543600 A CN 202210543600A CN 114874527 A CN114874527 A CN 114874527A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0268—Mats or sheets, e.g. nets or fabrics
- A01G13/0275—Films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming
Abstract
The invention discloses a bio-based controllable degradable mulching film, which comprises the following raw materials in parts by weight: 25-35 parts of polyethylene, 20-30 parts of rice husk, 1-2 parts of compatilizer, 2-3 parts of autoxidant, 0.6-0.8 part of processing aid and 2-4 parts of ultraviolet absorbent, wherein the rice husk needs to be subjected to decoloration and detoxification in advance to ensure the use effect of the rice husk, the compatilizer is a non-reactive compatilizer, and the polyethylene needs to be washed in advance, then crushed and crushed into master batch with proper particle size. The bio-based controllable degradable mulching film and the production method thereof can control the degradation rate of the degradable mulching film to a certain extent, can adjust according to actual environment conditions, improve the overall use effect, improve the overall tensile strength by adding the rice husks and the polyethylene, have strong adaptability when used in an external environment, prolong the overall service life to a certain extent, have low manufacturing cost and ensure the economic benefit of users.
Description
Technical Field
The invention relates to the technical field of degradable mulching films, in particular to a bio-based controllable degradable mulching film and a production method thereof.
Background
The biodegradable mulching film is a plastic mulching film which can be degraded under the action of microorganisms under natural environment conditions, and after microorganisms such as bacteria, fungi, actinomycetes and the like erode the plastic film, polymer components are hydrolyzed, ionized or protonated due to the growth of cells, and are mechanically destroyed and split into oligomer fragments. Enzymes secreted by fungi or bacteria break down or oxidatively degrade water soluble polymers into water soluble fragments, generating new small molecule compounds, until finally breaking down into C02 and H20. The biodegradable mulching film is a novel ground covering film, is mainly used for ground covering, and is used for improving the soil temperature, keeping the soil moisture, maintaining the soil structure, and preventing pests from attacking crops and diseases caused by certain microorganisms, so that the plant growth is promoted.
In the use process of the degradable mulching film, due to the external environment, most biodegradable mulching film products are broken and degraded too early, even the effects of protecting crops and increasing the yield of the mulching film cannot be achieved, the degradation speed of the biodegradable mulching film is closely related to the surrounding environment, such as illumination time, air temperature, soil biomass, water content and the like, besides being related to a base material and a formula, generally, the higher the ultraviolet ray is, the higher the surface temperature is, the higher the water content is, the higher the degradation speed is, and the higher the degradation degree is, so that the controllability of the existing degradable mulching film is not good, the overall effect is not good, and the degradable mulching film cannot be popularized in a large range.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a bio-based controllable degradable mulching film and a production method thereof, and solves the problem that the overall effect of the degradable mulching film is not good.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a bio-based controllable degradation mulching film comprises the following raw materials in parts by weight: 25-35 parts of polyethylene, 20-30 parts of rice husk, 1-2 parts of compatilizer, 2-3 parts of autoxidant, 0.6-0.8 part of processing aid and 2-4 parts of ultraviolet absorbent.
Preferably, the rice hulls need to be decolored and detoxified in advance, so that the using effect of the rice hulls is ensured.
Preferably, the compatibilizing agent is a non-reactive compatibilizing agent.
Preferably, the polyethylene is washed in advance and then crushed into a master batch with a proper particle size.
The invention also discloses a production method of the bio-based controllable degradable mulching film, which specifically comprises the following steps: s1, placing the polyethylene master batch into a crusher for crushing at a speed of 100-120 rpm for 30 minutes, cleaning the materials, drying the cleaned materials by a dryer at a temperature of 40-60 ℃ for 1 hour, and placing for later use;
s2, collecting a proper amount of rice hulls, cleaning the rice hulls with clear water, drying the cleaned rice hulls through a dryer, putting the dried rice hulls into a hydrolysis tank, adding a proper amount of active carbon, controlling the volume ratio of the active carbon to hydrolysis liquid in the hydrolysis tank to be 2 to 1, controlling the overall temperature to be 30-35 ℃, and reacting for 60min, so that the cleaned rice hulls can be well decolorized, drying the rice hulls through the dryer again after all decolorization is finished, putting the dried rice hulls into a pulverizer after air cooling, sieving the crushed rice hulls through a sieve plate with a sieve of 80-100 meshes, continuously sieving the rice hulls through the sieve plate repeatedly until the rice hulls are qualified, and standing the rice hulls for later use after cooling;
s3, mixing the materials placed and used in the S1 and the S2 with a compatilizer, a self-oxidant, a processing aid and an ultraviolet absorbent, controlling the temperature at 80 ℃, and then uniformly stirring for 30 minutes by a stirrer to achieve the purpose of completely mixing the materials;
and S4, feeding the material in the S3 into a double-screw extruder by a feeder, carrying out water ring or underwater granulation to obtain final master batches, and blowing the degradable granular material into the controllable degradable mulching film by adopting a high-speed film blowing machine.
(III) advantageous effects
The invention provides a bio-based controllable degradable mulching film and a production method thereof. The method has the following beneficial effects: the raw materials comprise the following components in parts by weight: 25-35 parts of polyethylene, 20-30 parts of rice husk, 1-2 parts of compatilizer, 2-3 parts of autoxidant, 0.6-0.8 part of processing aid and 2-4 parts of ultraviolet absorbent, wherein the rice husk needs to be subjected to decoloration and detoxification in advance to ensure the use effect of the rice husk, the compatilizer is a non-reactive compatilizer, the polyethylene needs to be washed in advance and then crushed into master batch with proper particle size, the bio-based controllable degradable mulching film and the production method thereof can control the degradation rate of the degradable mulching film to a certain extent, and can be adjusted according to the actual environment condition, the integral using effect is improved, the added rice husk and polyethylene improve the integral tensile strength, the adaptability is strong when using under the external environment, has increased holistic life to a certain extent, and the cost of manufacture is low, has guaranteed user's economic benefits.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides three technical schemes: a production method of a bio-based controllable degradable mulching film specifically comprises the following embodiments:
example 1
S1, putting 25 parts of polyethylene master batch into a crusher for crushing at a speed of 100 revolutions per minute for 30 minutes, cleaning the materials, drying the cleaned materials by a dryer at a temperature controlled between 40 ℃ for 1 hour, and then standing for later use;
s2, collecting 20 parts of rice hulls, cleaning the rice hulls with clear water, drying the cleaned rice hulls through a dryer, putting the dried rice hulls into a hydrolysis tank, adding a proper amount of active carbon, controlling the volume ratio of the active carbon to hydrolysis liquid in the hydrolysis tank to be 2 to 1, controlling the overall temperature to be 30 ℃, and reacting for 60min, so that the cleaned rice hulls can be well decolorized, drying the rice hulls through the dryer again after all decolorization is finished, putting the dried rice hulls into a pulverizer after air cooling, sieving the pulverized rice hulls with a sieve of 80 meshes, continuously sieving the rice hulls with the sieve repeatedly until the rice hulls are qualified, and cooling and placing the rice hulls for later use;
s3, mixing the materials placed and reserved in the S1 and the S2 with 1 part of compatilizer, 2 parts of autooxidizer, 0.6 part of processing aid and 2 parts of ultraviolet absorbent, controlling the temperature at 80 ℃, and then uniformly stirring for 30 minutes by a stirrer to achieve the purpose of completely mixing the materials;
and S4, feeding the material in the S3 into a double-screw extruder by a feeder, carrying out water ring or underwater granulation to obtain final master batches, and blowing the degradable granular material into the controllable degradable mulching film by adopting a high-speed film blowing machine.
Example 2
S1, putting 35 parts of polyethylene master batch into a crusher for crushing at a speed of 120 revolutions per minute for 30 minutes, cleaning the materials, drying the cleaned materials by a dryer at a temperature of 60 ℃ for 1 hour, and then standing for later use;
s2, collecting 30 parts of rice hulls, cleaning the rice hulls with clear water, drying the cleaned rice hulls through a dryer, putting the dried rice hulls into a hydrolysis tank, adding a proper amount of active carbon, wherein the volume ratio of the active carbon to hydrolysis liquid in the hydrolysis tank is 2 to 1, controlling the whole temperature at 35 ℃, and reacting for 60min, so that the cleaned rice hulls can be well decolored, drying the rice hulls through the dryer again after all decoloration is finished, putting the dried rice hulls into a crusher after air cooling, sieving the crushed rice hulls through a 100-mesh sieve, continuously sieving the rice hulls through a sieve plate repeatedly until the rice hulls are qualified, and cooling and placing for later use;
s3, mixing the materials placed and reserved in the S1 and the S2 with 2 parts of compatilizer, 3 parts of autooxidizer, 0.8 part of processing aid and 4 parts of ultraviolet absorbent, controlling the temperature at 80 ℃, and then uniformly stirring for 30 minutes by a stirrer to achieve the purpose of completely mixing the materials;
and S4, feeding the material in the S3 into a double-screw extruder by a feeder, carrying out water ring or underwater granulation to obtain final master batches, and blowing the degradable granular material into the controllable degradable mulching film by adopting a high-speed film blowing machine.
Example 3
S1, putting 30 parts of polyethylene master batch into a crusher for crushing at a speed of 110 revolutions per minute for 30 minutes, cleaning the material, drying the cleaned material by a dryer at a temperature of 50 ℃ for 1 hour, and then standing for later use;
s2, collecting 25 parts of rice hulls, cleaning the rice hulls with clear water, drying the cleaned rice hulls through a dryer, putting the dried rice hulls into a hydrolysis tank, adding a proper amount of active carbon, controlling the volume ratio of the active carbon to hydrolysis liquid in the hydrolysis tank to be 2 to 1, controlling the overall temperature to be 32 ℃, and reacting for 60min, so that the cleaned rice hulls can be well decolorized, drying the rice hulls through the dryer again after all decolorization is finished, putting the dried rice hulls into a pulverizer after air cooling, sieving the crushed rice hulls through a 90-mesh sieve, continuously sieving the rice hulls through a sieve plate repeatedly until the rice hulls are qualified, and cooling and placing the rice hulls for later use;
s3, mixing the materials placed and reserved in the S1 and the S2 with 2 parts of compatilizer, 2 parts of autooxidizer, 0.6 part of processing aid and 2 parts of ultraviolet absorbent, controlling the temperature at 80 ℃, and then uniformly stirring for 30 minutes by a stirrer to achieve the purpose of completely mixing the materials;
and S4, feeding the material in the S3 into a double-screw extruder by a feeder, carrying out water ring or underwater granulation to obtain final master batches, and blowing the degradable granular material into the controllable degradable mulching film by adopting a high-speed film blowing machine.
Effects of the embodiment
The experimental process comprises the following steps: 1. temperature resistance: the products prepared in the three examples were contacted with soil, the illumination intensity, the soil biomass and the water content were controlled to be consistent, the heating temperature was gradually increased until the products slowly started to degrade, and the temperature and time for the heating deformation of the products were recorded.
2. Tensile strength: the products obtained in the three examples were subjected to tensile tests and the results were recorded in MPa.
3. And (3) cost statistics: the costs of the products obtained in the three examples were counted and recorded.
Results of the experiment
The daily nylon co-extruded film on the market is randomly selected as a control group, then the temperature resistance, the tensile strength and the cost of the nylon co-extruded film are respectively detected, the detection conditions are consistent with those of the nylon co-extruded film, and the results are recorded, so that the following table is obtained, and the product prepared in the example 2 has the best effects of temperature resistance, tensile strength and cost.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A bio-based controllable degradation mulching film is characterized in that: the raw materials comprise the following components in parts by weight: 25-35 parts of polyethylene, 20-30 parts of rice husk, 1-2 parts of compatilizer, 2-3 parts of autoxidant, 0.6-0.8 part of processing aid and 2-4 parts of ultraviolet absorbent.
2. The bio-based controllable degradation mulch film according to claim 1, wherein: the rice husk is required to be subjected to decoloration and detoxification in advance, so that the using effect of the rice husk is ensured.
3. The bio-based controllable degradation mulch film according to claim 1, wherein: the compatibilizer is a non-reactive compatibilizer.
4. The bio-based controllable degradation mulch film according to claim 1, wherein: the polyethylene needs to be washed in advance and then crushed into master batch with proper particle size.
5. The bio-based controllable degradation mulch film according to any one of claims 1-4, wherein: the production method specifically comprises the following steps:
s1, placing the polyethylene master batch into a crusher for crushing at a speed of 100-120 rpm for 30 minutes, cleaning the materials, drying the cleaned materials by a dryer at a temperature of 40-60 ℃ for 1 hour, and placing for later use;
s2, collecting a proper amount of rice hulls, cleaning the rice hulls with clear water, drying the cleaned rice hulls through a dryer, putting the dried rice hulls into a hydrolysis tank, adding a proper amount of active carbon, controlling the volume ratio of the active carbon to hydrolysis liquid in the hydrolysis tank to be 2 to 1, controlling the overall temperature to be 30-35 ℃, and reacting for 60min, so that the cleaned rice hulls can be well decolorized, drying the rice hulls through the dryer again after all decolorization is finished, putting the dried rice hulls into a pulverizer after air cooling, sieving the crushed rice hulls through a sieve plate with a sieve of 80-100 meshes, continuously sieving the rice hulls through the sieve plate repeatedly until the rice hulls are qualified, and standing the rice hulls for later use after cooling;
s3, mixing the materials placed and used in the S1 and the S2 with a compatilizer, a self-oxidant, a processing aid and an ultraviolet absorbent, controlling the temperature at 80 ℃, and then uniformly stirring for 30 minutes by a stirrer to achieve the purpose of completely mixing the materials;
and S4, feeding the material in the S3 into a double-screw extruder by a feeder, carrying out water ring or underwater granulation to obtain final master batches, and blowing the degradable granular material into the controllable degradable mulching film by adopting a high-speed film blowing machine.
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